Air-pump.



Nrrlnn STATES Afrmrr` Grrlon.

ABNER A. PHIPPS, 0F' NEW YORK, N. Y.

AIR-PUMP.

SPECIFICATON forming part of Letters Patent N o. 717,760, dated January 6, 1903. Application filed February 1| 1902. Serial No. 92,115. (No modal.)

To a/ZZ whom it mur/y concern:

Be it known that 1, ABNER A. PHIPPS, of the city, county, and State of New York, have invented certain new and useful Improve` ments in Air-Pumps, of which the following is a full, clear, and exact description.

My invention relates to improvements in air-pumps, and particularly to that class of pumps which are intended for use in supplying a receptacle with air under pressure.

The object of my invention is to produce a simple and positive means of preventing leakage through the pump by back pressure, and another object is to provide means for preventing injury to the pump when it is operated by unskilful persons.

To these ends my invention consists of an air-pump the construction, arrangement, and operation of which will be hereinafter fully described and claimed.

Reference is to be had tothe accompanying drawings, forming part of this specification, in which similar figures of reference refer to similar parts throughout the several vie ws.

Figure 1 is a side elevation of .myim proved branding-iron, the reservoir of which is partly broken away, showing my improved pump applied thereto. Fig. 2 is an enlarged section of a portion of Fig. 1, showing my improved pump and the manner of securing the same to the reservoir. Fig. Sis a top view of the screw-cap, showing the slot through which passes the lug when the pump-rod is pushed home to close the pump against the pressure in the reservoir or tank. Fig. LL is a detail of a portion of Fig. 2, showingv the conical valve members separated, as during the operation of the pump. y

The branding device, (shown in Fig. 1,) to which my pump is attached and of which it forms a part, comprises a tubular oil-containing reservoir l, forming the handle of the branding-iron and having the air-pump 2. at its upper end, a burner 3, secured at its lower end, having the hollow neck part 4, through which theoil is forced from the reservoir, and a brand 5, supported below said burner by the rods 6. Against the upper or inner face of the brand the flame from the burner is directed.

The pump consists of the cylinder or ing 7, the pump-rod S, and piston 9.

cas- The outlet end of said pump-cylinder is closed by the plug 10, having the central bore 11 and the stern 12. In the stem 12 is the well-known ball-and-spriug valve,consisting of the spring 13, the ball 14, and the valve-seat 15. The

spring 13 forces the ball 14 against its seat 15, and thus prevents the escape of air from the reservoir or tank back through the pump. The other end of the pump is provided with the usualscrew-cap 16, through which passes the pump-rod 8. The pump is secured in the tank or reservoir casing by the threaded bushing 17, which screws into the filling-hole 18 in the tank, forming with the pump a plug or stopper therefor. Awasher 19 prevents leakage around the bushing. For the purpose of preventing damage to the pump in the handling of the reservoir or tank the pump projects into the reservoir, so as to leave only the handle and top-cap outside the tank. By the Well -known operation of the pump air is forced out through the valve-stem 12 into the tank or reservoir, creating a pressure therein. Because of the constant handling and of the reduction of pressure in the reservoir caused by the use of its contents the seating pressure against the ball of the valve in the stem 12 will be reduced and the valve will leak, and thus waste the pressure of air in the reservoir. To obviate this, I have provided means presently described for positively closing the central outlet-bore 11 of the air-pump. At the inner side of the plug 10 the bore l1 is enlarged and screw-threaded at, 20, and this enlarged bore terminates in a conical valve-seat 21. The pump-rod 8 extends beyond the piston, and its end 22 is conical and is ground to tightly fit the conical valve-seat 21. Screw-threads`23 on the pump-rod between its conical end and the piston engage the screw-threads 2O in the inner end of the plug 10 and tightly seal the valvek members 20 and 21 and positively close the pu mp against the backward air-pressure from the reservoir or tank. In' order to prevent the stripping of the threads() and 23 upon the pump-rod andend plug, l provide the lug 24 on the pump-rod at such a distance from the screw-threaded end that during the operation of the pump-rod this lug will strike against the top and outside of the screw-cap 16 and prevent the stripping of the threads, which lIoo would occur if the pump-rod were pushed clear home. Then sucient air-pressure is created in the reservoir and it is desired to seal the pump against the leakage therethrough of such pressure, the pump-rod is turned so that its luf,r 24 Will pass in through a slot 25 (see Fig. 3) in the screw-cap, and the pump-rod may be then pushed home and its conical end secured in its seat by the screwthreads 2O and 23.

Obviously my pump is as Well adapted for use as a disconnected hand-pump, and when so used connection is made by means of the screw-threads 26 on the end of the stem 12.

Having lthus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination With the pump having the usual piston and discharge, a valve-seat in the receiving end of said discharge, of a valve carried by the piston to t the seat, and means as the threaded parts in the discharge and on the valve-stem to secure the valve in closed position.

2. The combination with the pump having the customary piston provided With a valve, a valve-seat in the receiving end of the discharge, of a limiting device to prevent the valve parts from coming together during the reciprocation of the piston.

3. The combination with the pump having the usual discharge and a reciprocating piston, of a valve-seat in the discharge end of the pump, a valve carried by the piston and adapted to screw into its seat, and a limiting device to prevent the threaded parts of the valve and seat from contacting when the pump is operated.

.4. The combination with the pump having the usual discharge and reciprocating piston, of the valve mechanism arranged in the discharge end of the pump and on the piston, and means as the pump-cap and the lug on the pump-rod to prevent the valve parts from contacting While the pump is in operation.

5. The combination of the pump having the usual discharge and a reciprocating piston, a valve on the piston, a valve-seat in the receiving end of the discharge, and means for locking said valve on its seat.

6. The combination of the pump having the usual discharge and a reciprocating piston, a valve on the piston, a valve-seat on the receiving end of said discharge, means for locking said valve on the seat, and a stop for limiting the movement of the piston when the valve parts are disengaged.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

- ABNER A. PHIPPS.

In presence of.-

WARREN B. HUTcHINsoN, EDWARD P. CLARKE. 

